Focus detecting apparatus

An optical information recording and reproduction system uses an objective lens (5) to focus a light beam onto the information-carrying medium (6). To ensure the beam is focused correctly part of the reflected beam is transmitted to an optical component (10) which has a reflecting surface (11) with...

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Bibliographic Details
Main Authors IMAI, HITOSHI, TADOKORO, MICHIHIRO, OKADA, KAZUO
Format Patent
LanguageEnglish
French
German
Published 26.10.1988
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
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Summary:An optical information recording and reproduction system uses an objective lens (5) to focus a light beam onto the information-carrying medium (6). To ensure the beam is focused correctly part of the reflected beam is transmitted to an optical component (10) which has a reflecting surface (11) with reflectivity or transmissivity which varies continuously with respect to the angle of incidence. A photo-detector (9) senses the distribution of intensity of the beam reflected by the surface (11).
Bibliography:Application Number: EP19880303472